Multiplex communications – Wide area network – Packet switching
Patent
1992-08-17
1995-08-15
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
34082505, 359110, 359118, 370 8512, H04J 116
Patent
active
054426235
ABSTRACT:
A self healing, passive protected ring network and a method of operation are disclosed. The ring network includes a plurality of active nodes interconnected by optical fibers into a working ring. The ring network also includes a passive optical fiber protection ring which interfaces with the working ring through a small number of optical switches located at each node. In the event of a failure in the optical fibers or nodes of the working ring, the optical switches are set to interconnect the protection ring to the nodes on either side of the failure and to bypass all other nodes. It is a particular advantage of the present invention that the protection ring may be installed without modifying or adding to the active electronic equipment at each node and remains unchanged when the working ring's equipment is upgraded to a higher line transmission rate.
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Bell Communications Research Inc.
Hom Shick
Olms Douglas W.
Suchyta Leonard Charles
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